According to Wikipedia, Twitter is an online social networking andservice that enables its users to send and read text-based messages, called “tweets.” A helpful way to think of Twitter is to picture a constantly flowing stream of water. Tweets are the stream. As a user, you dip your toes in and out of the ongoing stream of tweets. You can’t expect to take it all in, simply read a few tweets and then step out. Kimberly Tyson